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Enhanced electrocatalytic activities in TiO_(2)-sulfur nanoparticles decorated graphene nanocomposite electrode for detecting formaldehyde compound

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Chinese Journal of Chemical engineering 2025年第4期80卷 213-219页

作者： Maulidiyah Maulidiyah Muhammad Nurdin WD Syafitri Salsabila Suryani Dyah Astuti Thamrin Azis La Ode Muhammad Zuhdi Mulkiyan La Ode Agus Salim Akrajas Ali Umar Department of Chemistry Faculty of Mathematics and Natural SciencesUniversitas Halu OleoKendari 93232Southeast SulawesiIndonesia Department of Environmental Engineering Universitas Muhammadiyah Kendari 93121 Southeast SulawesiIndonesia Department of Chemistry Faculty of EngineeringUniversitas Sulawesi TenggaraKendari 93121Southeast SulawesiIndonesia Biomedical Engineering Study Program Department of PhysicFaculty of Science and TechnologyUniversitas AirlanggaSurabaya 61115Indonesia Department of Chemistry Faculty of Science and TechnologyInstitut Sains Teknologi dan Kesehatan(ISTEK)Aisyiyah KendariKendari 93116Southeast SulawesiIndonesia Institute of Microengineering and Nanoelectronics University Malaysian nationalityUKMBangi 43600SelangorMalaysia

The unique properties of TiO_(2)-sulfur(TiO_(2)-S)modified graphene nanocomposite electrode(GPE/TiO_(2)-S)in the electrochemical sensing of formaldehyde compound has been *** prepared TiO_(2)-S by hydrothermal method and modified the graphene nanocomposite electrode by applying electrochemical cyclic voltammetry(CV)*** TiO_(2)-S nanocomposite was characterized by X-ray diffraction(XRD),while the GPE/TiO_(2)-S was examined by scanning electron microscopy(FESEM)and X-Ray fluorosense(XRF)***_(2)-S has a grain size of 19.32 *** surface morphology of the GPE/TiO_(2)-S nanocomposite shows a good,intact,and tightly porous structure with TiO_(2)-S covers the graphene *** content of optimized GPE/TiO_(2)-S electrodes is 41.5%of graphene,37.8%of TiO_(2),and 12.4%of sulfur that was prepared by mixing 1 g of TiO_(2)-S with 0.5 g of graphene and 0.3 mL *** GPE/TiO_(2)-S electrode produces a high anodic current(I_(pa))of 800μA and a high cathodic current(I_(pc))of-600μA at a scan rate of 0.1 V·s^(-1)using an electrolyte0.01 mol·L^(-1)K_3[Fe(CN)_6]solution containing 150 mg·L^(-1)*** limit of detection can reach as low as 9.7 mg·L^(-1)with stability with Horwitz ratio value as low as *** composite electrode also exhibits excellent slectivity properties by showing clear formaldehyde sugnal in the presence of high concentration of interfering ***/TiO_(2)-S electrode should find potential application of formaldehyde detection in food industries.

关键词： Food safety Formaldehyde Voltammetry Graphene TiO_(2)-S

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Evaluated Material Attractiveness of Plutonium Composition from Economic Simplified Boiling Water Reactor (ESBWR) 10

Evaluated Material Attractiveness of Plutonium Composition f...

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10th Asian Physics Symposium 2023, APS 2023

作者： Nasyidiah, Fungky Iqlima Permana, Sidik Pramuditya, Syeilendra Master Program in Nuclear Science and Engineering Faculty of Mathematics and Natural Sciences Institute Technology of Bandung Ganesa 10th Street Bandung40132 Indonesia Department of Nuclear Science and Engineering Faculty of Mathematics and Natural Sciences Institute Technology of Bandung Ganesa 10th Street Bandung40132 Indonesia

The potential for misuse of nuclear fuel has prompted many to make efforts to prevent a country from acquiring nuclear explosive devices (weapons). Weapon utility equated with nuclear material attractiveness when applied to protection and security. Material attractiveness evaluated using an equation first developed by Masaki Saito, namely ATTR. ESBWR is one of the reactors of the BWR reactor type that is still operating. The purpose of this study is to evaluate Material Attractiveness based on the composition of plutonium in the ESBWR reactor, during reactor operation and after reactor operation. The ATTR concept utilizes the plutonium isotope composition to evaluate the material attractiveness aspect. Parameters such as BCM, Rossi-alpha, and neutron prompt life become additional aspects in evaluating material attractiveness. In the research results, the ATTR value decreased from the beginning of reactor operation until the reactor stopped operating. At the beginning of the reactor operation, it was categorizing as a weapon-grade with an ATTR value of 0.19 and when the reactor stopped operating it was categorizing as an unusable grade with an ATTR value of 0.012. At the time of cooling time up to 1x106 (one million) cooling time, the ATTR value increases by 0.019 which was categorizing as an unusable grade. After a cooling time of 1x106 (one million) years up to 1x107 (ten million) years, the ATTR value was 0.001 which categorized as an exempt level. This states that the increasing burnup value will further reduce the ATTR value. Likewise with the Rossi-Alpha and Bare Critical Mass values. Conversely, it will decrease the value of neutron lifetime. The ATTR value after the reactor operates up to one hundred years of cooling time increases and then decreases significantly after 1x106 (one million) years due to the half-life of plutonium isotopes. Likewise, the Rossi-Alpha and Bare critical mass values. However, it is different with the neutron fast lifetime. © Publis

关键词： Boiling water reactors

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Scalable electrochemical grafting of anthraquinone for fabrication of multifunctional carbon fibers

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Journal of Materials Science & Technology 2024年第33期200卷 162-175页

作者： Piers Coia Bhagya Dharmasiri Filip Stojcevski David J.Hayne Elmer Austria Jr. Behnam Akhavan Joselito M.Razal Ken Aldren S.Usman Melissa K.Stanfield Luke C.Henderson Institute for Frontier Materials Deakin UniversityWaurn PondsVictoria 3216Australia DSTG Victoria 3168Australia School of Biomedical Engineering Faculty of EngineeringUniversity of SydneySydneyNSW 2006Australia School of Engineering University of NewcastleCallaghanNSW 2308Australia Hunter Medical Research Institute(HMRI) Precision Medicine ProgramNew Lambton Heights NSW 2305Australia School of Natural Sciences–Chemistry University of TasmaniaHobartTasmania 7005Australia

Carbon fiber electrodes were prepared by grafting anthraquinone molecules via a scalable electrochemical approach which simultaneously increased interfacial and electrochemical capacitance *** this work,anthraquinone diazonium salts were synthesized and grafted onto carbon fiber tows at various *** modified fibers were subsequently evaluated mechanically and electrochemically to analyze their suitability in structural *** to control fibers,the grafted anthraquinone groups resulted in a 30%increase in interfacial shear strength(IFSS)and 6.6×increase in specific *** application was also a focus thus carbon fibers were also modified with insitu generated diazonium salts to determine the applicability to an in-line industrial ***,potentiostatic functionalization of fibers with in-situ generated diazonium salts AQ-1 and AQ-2,showed 3×and 4.3×increase in specific capacitance,respectively,relative to unmodified carbon fiber(CF).We expect that implementing a scalable method to introduce a conductive and electrochemically active covalently bound surface chemistry layer onto carbon fiber exhibits a higher specific capacitance than carbon fiber grafted with most other small molecules reported in *** will open new avenues for manufacturing multifunctional and high-performance fibers with tailored properties for specific/targeted applications.

关键词： Carbon fiber Energy storage Interface Surface modification

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RFI measurements at Bosscha observatory to prepare a new VGOS station

RFI measurements at Bosscha observatory to prepare a new VGO...

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2023 International Symposium From the Universe Back to Earth: Developing Astronomy to Meet Today's natural Challenges

作者： Ramadhan, S. Hidayat, T. Suryana, J. Romadhoni, A. Kurniasari, M. Bosscha Observatory Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Indonesia Astronomy Study Program Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Indonesia Laboratory of Radio and Microwave Telecommunication School of Electronics and Informatics Engineering Institut Teknologi Bandung Indonesia

A new VGOS (VLBI Global Observing System) radio telescope will be constructed at Bosscha Observatory Lembang, West Java, in cooperation between Shanghai Astronomical Observatory (SHAO) and Institut Teknologi Bandung. One of the preparation steps is to conduct RFI (Radio Frequency Interference) measurements to obtain the RFI environment from the vicinity of the observatory. In this work, we report preliminary measurements of the RFIs that were done for several days in August and September 2023. Instruments used includes: A-INFOTM LB-20180 horn antenna, Wright TechnologiesTM low noise amplifier, and AaroniaTM Spectran V5 80200 OEM spectrum analyzer. The frequency range of 2.0 - 18.0 GHz is targeted referring to VGOS frequencies. Measurements in one day are carried out for about 24 hours in eight cardinal directions and two polarizations. The results and analysis are presented in spectral power flux density plots. © Published under licence by IOP Publishing Ltd.

关键词： Observatories

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Fine and ultrafine particle- and gas-polycyclic aromatic hydrocarbons affecting southern Thailand air quality during transboundary haze and potential health effects

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Journal of Environmental sciences 2023年第2期124卷 253-267页

作者： Napawan Mahasakpan Phatsarakorn Chaisongkaew Muanfun Inerb Nobchonnee Nim Worradorn Phairuang Surajit Tekasakul Masami Furuuchi Mitsuhiko Hata Thaniya Kaosol Perapong Tekasakul Racha Dejchanchaiwong Air Pollution and Health Effect Research Center Prince of Songkla UniversityHat YaiSongkhla 90110Thailand Energy Technology Program Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla 90110Thailand Faculty of Environmental Management Prince of Songkla UniversityHat YaiSongkhla 90110Thailand Department of Geography Faculty of Social SciencesChiang Mai UniversityMuangChiang Mai 50200Thailand Department of Chemistry Faculty of SciencePrince of Songkla UniversityHat YaiSongkhla 90110Thailand Faculty of Geoscience and Civil Engineering Institute of Science and EngineeringKanazawa UniversityKakuma-machiKanazawaIshikawa 920-1192Japan Department of Civil and Environmental Engineering Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla 90110Thailand Department of Mechanical and Mechatronics Engineering Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla 90110Thailand Department of Chemical Engineering Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla 90110Thailand

Distribution of PM_(0.1),PM_(1) and PM_(2.5) particle-and gas-polycyclic aromatic hydrocarbons(PAHs)during the 2019 normal,partial and strong haze periods at a background location in southern Thailand were investigated to understand the behaviors and carcinogenic ***1 was the predominant component,during partial and strong haze periods,accounting for 45.1% and 52.9% of total suspended particulate matter,respectively,while during normal period the contribution was only 34.0%.PM_(0.1) concentrations,during the strong haze period,were approximately 2 times higher than those during the normal *** increased levels of particle-PAHs for PM_(0.1),PM_(1) and PM_(2.5) were observed during strong haze period,about 3,5 and 6 times higher than those during normal ***-PAH concentrations were 10 to 36 times higher than those of particle-PAHs for PM_(2.5).Average total Benzo[a]Pyrene Toxic Equivalency Quotients(BaP-TEQ)in PM_(0.1),PM_(1) and PM_(2.5) during haze periodswere about 2–6 times higher than in the normal *** total accumulated Incremental Lifetime Cancer Risks(ILCRs)in PM_(0.1),PM_(1) and PM_(2.5) for all the age-specific groups during the haze effected scenario were approximately 1.5 times higher than those in nonhaze scenario,indicating a higher potential carcinogenic *** observations suggest PM_(0.1),PM_(1) and PM_(2.5) were the significant sources of carcinogenic aerosols and were significantly affected by transboundary haze from peatland *** leads to an increase in the volume of smoke aerosol,exerting a significant impact on air quality in southern Thailand,as well as many other countries in lower southeast Asia.

关键词： Particle-PAH Gas-PAH Ultrafine particle Health risk Source identification

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Lignin-based polyurethane composites enhanced with hydroxyapatite for controlled drug delivery and potential cellular scaffold applications

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Polymer Composites 2024年第16期45卷 15159-15172页

作者： Nugroho, Roshid Adi Saputra, Ozi Adi Pradita, Agung Lucky Fajar, Al Bukhori Nur Wibowo, Fajar Rakhman Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Sebelas Maret Central Java Surakarta Indonesia Sustainable Chemical Science and Technology Taiwan International Graduate Program Academia Sinica Taipei Taiwan Institute of Chemistry Academia Sinica Taipei Taiwan Department of Chemical Engineering Collage of Engineering National Taiwan University Taipei Taiwan

Polymer technology has rapidly advanced across diverse domains, particularly in biomedical applications. Among various polymers, polyurethane (PU) hold great potential in developing biomaterials such as biomedical scaffold and drug delivery. In this study, we have innovatively engineered eco-friendly polyurethane using lignin, a sustainable bio-polyol derived from oil palm empty fruit bunches. To enhance the physicochemical properties of the PU, we have incorporated hydroxyapatite (HA) into the composites. The inclusion of HA has led to notable improvements in crucial properties such as density, porosity, and water absorption, making these composites ideal candidates for tissue regeneration scaffolds. Furthermore, to assess their biomedical applicability in drug delivery and cell scaffolding, we have employed the quercetin drug model. The results revealed a sustained kinetic release behavior within the polyurethane/hydroxyapatite (PU/HA) composites, showcasing their potential for controlled drug delivery applications. Moreover, cytotoxicity assays conducted using neuro-2a cell models demonstrated the non-cytotoxic nature of both PU and PU/HA composites. This finding holds significant implications for biomedical applications, indicating that these composites offer biocompatible platforms for tissue engineering and regenerative medicine endeavors. The ability of these composites to support cell viability underscores their potential for a wide range of biomedical applications, including neural tissue engineering and drug delivery systems targeting brain diseases. These findings pave the way for the development of innovative and sustainable biomaterials with diverse biomedical applications. Highlights: An eco-friendly polyurethane has been engineered by harnessing liginin-derived oil palm empty fruit bunches. Incorporation of hydroxyapaptite enhance the physical properties of polyurethane. Controlled kinetic drug release is one of polyurethane/hydroxyapatite (PU/HA) com

关键词： Fruits

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Integrative analysis of datasets of proteins in Sjogren's syndrome patients

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Revista Colombiana de Reumatologia 2023年第3期30卷 238-242页

作者： Triana Vidal, Luz Elena Gutiérrez, Nicolás Cardona, Camilo Núñez Torres, Jorge Brayam Agudelo Ocampo, Mónica Yulieth Medicine Program Research Group in Epidemiology and Services (Griepis) Faculty of Health Sciences Universidad Libre Cali Colombia Biology Program Department of Natural Sciences and Mathematics Biphotonics Research Group Faculty of Engineering and Sciences Pontificia Universidad Javeriana Cali Colombia

This study aims to compare reported proteins expressed in controls and patients with SS in tear, saliva and serum from proteins identified in papers published between 2000 and 2020, to obtain a systematic comparison of proteins expressed in SS patients to find proteins that can be used as biomarkers in SS. Differentially expressed proteins from Sjögren's patients identified in the studies were classified by body fluid (saliva, serum, tear and saliva from healthy patients). Protein pairing was carried out in RStudio, using the previously created data framework, PANTHER and REACTOME 7.O. were used to explore the type of proteins associated with SS and enriched metabolic pathways. Five differentially expressed proteins were found in saliva, tear, and serum. Finally, this study suggests antithrombin III and E-cadherin. as biomarkers in SS, because these proteins are differentially expressed in plasma, blood, and tear, and that neutrophil degranulation pathway as a target for SS. © 2022 Asociación Colombiana de Reumatología

关键词： Biomarker Protein Sjögren's syndrome Systematic comparison

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Affordable ESP32-based monitoring system for microbial fuel cells: real-time analysis and performance evaluation (ESP32-based data logger as a monitoring system for microbial fuel cell)

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International Journal of Energy and Water Resources 2024年第2期8卷 199-212页

作者： Indriyani, Y.A. Efendi, R. Rustami, E. Rusmana, I. Anwar, S. Djajakirana, G. Santosa, D.A. Study Program of Soil Sciences Graduate Schools IPB University Bogor Indonesia Department of Mechanical Engineering Faculty of Engineering Universitas Sulawesi Tenggara Kendari Indonesia Department of Physics Faculty of Mathematics and Natural Sciences IPB University Bogor Indonesia Department of Biology Faculty of Mathematics and Natural Sciences IPB University Bogor Indonesia Department of Soil Science and Land Resource Faculty of Agriculture IPB University Bogor Indonesia Biotechnology Center Research and Community Empowerment Institute IPB University Bogor Indonesia

Microbial fuel cells (MFCs) are bioelectrochemical instruments that exploit living microbes as biocatalysts for the conversion of chemical energy stored in the bonds of substrates into electrical energy. Monitoring of current or voltage generation in microbial fuel cells at rigid time intervals is noteworthy. Unfortunately, bioelectrochemical studies are often constrained due to the need for expensive and precise devices for electrochemical measurements. Utilization of low-cost microcontroller as monitoring system can be a considerable solution, compared with data logger that is a high-cost device, or compared with commercial multimeter that have to be used manually in collecting data. In this present work, microbial fuel cells electricity generation was successfully online monitored and the voltage data was also successfully collected using an ESP32 based-data logger. Statistically, there was no significant difference between ESP32 and multimeter in voltage reading, and the average of absolute and relative error values were 0.85 mV and 2.72%, respectively. It suggested that ESP32 could be a possible and low-cost monitoring system for microbial fuel cells bioelectricity generation. Additionally, ADS1115 (an external analogue to digital converter interface to ESP32) has up to four analogue channels, whereas multimeter has just one. In this research, microbial fuel cell powered by isolate KCf1 generated highest voltage value of 789 mV and power density of 541 mW m⁻². © The Author(s), under exclusive licence to Iranian Society of Environmentalists (IRSEN) and Science and Research Branch, Islamic Azad University 2023.

关键词： Biofuel Electricity Electrochemistry Green technology Renewable energy

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Eco-friendly synthesis, characterization, and antimicrobial studies of Zinc oxide nanoparticles using Cassia Javanica Leaf extract

Eco-friendly synthesis, characterization, and antimicrobial ...

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2024 International Conference on Science, engineering and Business for Driving Sustainable Development Goals, SEB4SDG 2024

作者： Owoeye, Taiwo Felicia Bamisaye, Abayomi Eterigho, Emetere Moses Afolalu, Sunday A. Monye, Stella Isioma Oluwatoyin, Ojo Augustine Lead City University Department of Chemical Sciences Ibadan Nigeria Covenant University Department of Chemistry Sango Ota Nigeria Lead City University Faculty of Natural and Applied Sciences Department of Chemical Sciences Ibadan Nigeria BOWEN University Faculty of Engineering Department of Physics Iwo Nigeria Afe Babalola University Department of Mechanical and Mechatronics Engineering Ado-Ekiti Nigeria Science University of Johannesburg Department of Mechanical Engineering South Africa Afe Babalola University Department of Mechanical and Mechatronics Department Ado-Ekiti Nigeria Afe Babalola University Mechanical and Mechatronics Ado-Ekiti Nigeria

ISBN: (纸本)9798350358155

The green approach for metal oxide Nanoparticles (NPs) synthesis is a current discuss in material science and nanotechnology, which is quick, simple, cost-effective, and environmentally friendly. This study aims at the biogenic zinc oxide nanoparticles synthesis (ZnONPs) using Cassia Javanica leaf extracts and Analyzing its antibacterial properties activities;Zones of Inhibition (ZI) and Minimum Inhibitory Concentration (MIC) on Salmonella, Candida, Escherichia coli, Staphylococcus, and Pseudomonas aeruginosa. The ZnONPs were characterized using a UV-Vis spectrophotometer, XRD, FTIR, EDX, and SEM. The FTIR shows that the metal oxide nanoparticle wavenumber was at 700cm-1, which was corroborated by EDX chemical *** show spherical crystalline nanoparticles having an average size of particles of 41.85 nm. The recorded ZI values for Salmonella, Candida, Escherichia coli, Staphylococcus, and Pseudomonas aeruginosa are 32.00, 48.00, 0.00, 34.00 and 40.00 mm respectively. Also, the MIC for Salmonella, Candida, Escherichia coli, Staphylococcus, and Pseudomonas aeruginosa are 7.81, 3.90, 0.00, 31.25 and 7.81 mg/mL respectively. The findings of this study revealed the antimicrobial properties of Zinc oxide nanoparticles (ZnONPs) using Cassia Javanica leaf extract suggesting that it is a possible contender for use in biomedical applications. © 2024 IEEE.

关键词： Yeast

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Anti-Termite Activity of Azadirachta excelsa Seed Kernel and Its Isolated Compound against Coptotermes curvignathus

Journal of the Korean Wood Science and Technology

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Journal of the Korean Wood Science and Technology 2023年第3期51卷 157-172页

作者： Adfa, Morina Wiradimafan, Khafit Pratama, Ricky Febri Sanjaya, Angga Triawan, Deni Agus Yudha S., Salprima Ninomiya, Masayuki Rafi, Mohamad Koketsu, Mamoru Department of Chemistry Faculty of Mathematics and Natural Sciences University of Bengkulu Bengkulu38371 Indonesia Research Center of Sumatera Natural Product and Functional Materials University of Bengkulu Bengkulu38371 Indonesia Master of Chemistry Study Program Faculty of Mathematics and Natural Sciences University of Bengkulu Bengkulu38371 Indonesia Department of Chemistry and Biomolecular Science Faculty of Engineering Gifu University Gifu5011193 Japan Department of Chemistry Faculty of Mathematics and Natural Sciences IPB University Bogor16128 Indonesia Tropical Biopharmaca Research Center-Institute of Research and Community Services IPB University Bogor16128 Indonesia

Azadirachta excelsa, is a plant belonging to the same genus as Indian neem (Azadirachta indica), and its use as a pesticide is reported by few studies. Despite being a different species, it is expected to have the same biopesticide potential as A. indica. Therefore, this study aims to investigate the anti-termite activity of n-hexane and methanol extracts of A. excelsa seed kernel at various concentrations against Coptotermes curvignathus. The methanol extract demonstrated greater termicidal activity than n-hexane at doses test of 2%, 4%, and 8%. It also showed 100% termite mortality on the third day of administering the 8% dose. According to the gas chromatography with mass spectrometry data, the putative main components of the n-hexane extract were hexadecanoic acid, ethyl ester (18.99%), 9,12-octadecadienoic acid (Z,Z)-(16.31%), and 9-octadecenal (16.23%). In contrast, the principal constituents of methanol extract were patchouli alcohol (28.1%), delta-guaiene (15.15%), and alpha-guaiene (11.93%). Furthermore, limonoids profiling of A. excelsa methanol extract was determined using Ultrahigh-performance liquid chromatography coupled with quadrupole-Orbitrap high-resolution mass spectrometry. The number of limonoids identified tentatively was fifteen, such as 6-deacetylnimbin, nimbolidin C, nimbolide, 6-acetylnimbandiol, 6-deacetyl-nimbinene, salannol, 28-deoxonimbolide, gedunin, nimbandiol, epoxyazadiradione, azadirone, 2',3'-dihydrosalannin, marrangin, nimbocinol, and azadirachtin. They were the same as those reported in the seed and leaves of A. indica, but its largest component in A. excelsa was 6-deacetylnimbin. As a result, the presence of these compounds may be responsible for the anti-termite activity of A. excelsa seed kernel extract. Additionally, column chromatography of methanol extract yielded 6-deacetylnimbin, which was found to be antifeedant and termiticide against C. curvignathus. © 2023 The Korean Society of Wood Science & Technology.

关键词： Mass spectrometry

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